Closure



April 24, 192 s. 1,667,084

D. STERN CLOSURE Filed July 21. 1926 [Ill/6n Z01 flaz/id Sh rla By I Patented A -"24 1928.

UNITED STATES DAVID swan, or nonennsrnn, massacnusnrrs.

' cnosunn.

Application as my 21, 1926. serial no..1'2s,s74.

This invention relates to "closure structures for metal containers and particularly to a removable closure which'cannot be dislodged from the container except by the ap plication of external force.

Heretofore there have been many developments in closures for cans adapted to hold a liquid content such as paint. Many of these have been of aremovable type, but have been so constructed that their union with the flanges on the top of the can has to prevent see-page of not been tight enough the content of the can between the flanges of the can and the closure, this seepage being greater according to the nature of the content of the can and the temperature ofthe atmosphere. It is well known that metals .such as tin or iron contract and expand with changes in temperature or condition, so that the cover may not at all times be as tightly held in the mouth of the can as when first inserted. I

My invention has been developed to overcome the deficiencies of structure of the usual container and closure, but I have discovered that this end may be accomplished by relatively simple means, a practical embodiment of which is disclosed in the specification and claims. In the drawings:

Fig. 1 is a sectional elevation showing the can with closure removed.

Fig. 2 is a similar view showing the closure in position on the can, and

Fig. 3 is a sectional view through the can on the line 3-3, of F ig. 2.

The can member 1- is of usual construction and of any suitable material. This can. member at one of its ends is provided with an opening 2, the metal about the openmg being shaped to provide a cover seat 3 and a downwardly extending flange 4.

The depending flange 4 is formed at its lower edge with a slightly outwardly flarmg formation as indicated at 4 This portlon 4 as shown in Fig. 2 is so proportioned as to bear on the upper part of the protuberance 8 when the closure is seated.

The closure member 5 is provided with the usual annular flange 6 to overlie. the cover seat 3,-and the usual depressed portion with the side wall 7 which in my invention is provlded with one or more protuberances or bulges 8 struck out from the surface of the wall. The number and shape of .thesejpro-v tuberances 8 may be varied, or; the protuberances shown in the drawings may be extend- .cd or merged into a single annular ridge or groove about the entire circumference of the central depressed cover portion near the bottom of the wall 7.

When it is desired to seal the can 1, for

example after it has been filled, the cover is placed in position and forced into the .opening2 until the flanges 6 overlie the cover seat 3. The protuberances 8 are so arranged on the vertical'wall .7 of the cover so that when the cover is thus positionedon the can, these protuberances 8 have been forced past and lie just below the downturned flange 4 of the can member, thus affording a union of the closure and can which cannot be dislodged except by outside effort. In this position the portion 4 of the flange 4 bears tightly on the upper portion of the protuberances 8 so as to give a firm bearing thereon but. on account of the angle of disposition of the portion 4 the resultl ant tendency of the prying action of a tool of the mouth of the can, it is possible to rem-ove theclosure by outside leverage without any deformation or breakage of either the can or closure. Without the application of considerable force, however, itis imposs1ble to loosen or dislodge the cover from the can.

Thus my invention overcomes the difiiculty heretofore existing which permitted the leakage of the content "of the can, as the can and cover' became loosened through vibration or by the shrinkage of the metal, which released the frictional union of the parts.

It will be appreciated that my invention resides in the provision of any form of protuberance and the position of such protuberance or .its sizeor extent is immaterial so long as it resiliently engages the mouth of the can. The same results as are accomplished by a single relatively large rotuberance may be secured, for example, y the continuous annular groove referred to above.

Various modifications in the construction and operation of my device may be resorted to without departing from the spirit'of my invention if within the limits of the appended claims.

What I therefore claim and desire to secure by Letters Patent is: V

1. In combination with a can having a depending resilient lip outwardly turned at its ower edge within its mouth, a cup shaped closure therefor comprising a bottom portion and a side wall having an outwardly disposed lip engaging portion disposed for engagement with the edge of the lip of the container mouth when the closure is in seated position.

2. In combination with a cam having a depending resilient lip within its mouth, a cup shaped closure comprising a bottom portion,

and a side wall, and a protuberance on said side wall and disposed thereon so as to be lodged below the edge of the lip of the container when the closure is in seated position, said depending lip having an out-turned edge co-operative with said protuberance.

3. In combination with an open mouthed container having a downwardly extending resilient annular lip within its mouth, a clov sure comprising a bottom portion and an up- 3 wardly extending Wall, an outwardly disposed lip engaging portion on said wall resiliently engageable with the annular lip of the container mouth to prevent accidental removal of the cover from the container, said '3 annular lip and outwardly disposed portion having cooperative surfaces at an angle to the vertical axis'of the container.

4.'In combination with an open ended container having adownwardly extending resilient. annular lip within its mouth, a closure comprising an inset bottom portion and an upwardly' extending wall, an outwardly disposed lip engaging portion on said wall resiliently engageable with the annular lip of the container month, said annular lip having an outwardly inclined edge adapted to bear on the lip engaging portion to permit said lip engaging portion to crowd therepast, and returning by its own resil- I iency to present a stop resistive to accidental removal of the cover from the container.

In testimony whereof I aflix my signature.

DAVID STERN. 

